Pressure-gage.



PATENTED SEPT. 8, 1908.

G. SPENCER.

PRESSURE GAGE. APPLICATION FILED 1130.14, 1907.

Jzvmarvfiaw. 6603176 fipemcez; W Wwz/ owing UNITED STATES PATENT OFFICE.

GEORGE SPENCER, OF MEDFORD, MASSACHUSETTS, ASSIGNOR TO CROSBY STEAM GAGEAND VALVE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

PRESSURE-GAGE Application filed December 14, 1907.

To all whom it may concern:

Be it known that I, GEORGE SPENCER, a citizen of the United States, andresident of Medford, in the county of Middlesex and State ofMassachusetts, have invented. cer tain new and useful Improvements inPressure-Gages, of which the following is a specification.

My invention relates to index mechanisms, employed in pressure gages, inwhich a sector engages and actuates a pinion which carries an index orpointer adapted to indicate upon a dial the pressure of the gage towhich the mechanism is attached.

The invention relates more particularly to the mounting of the pinionand its object is to do away with the wear and tear incident to thepresent method of mounting such pinion and to avoid the resulting injuryto the mechanism and inaccuracy of the records.

*Ieretofore the pinion has been rigidly mounted on a shaft journaled inthe frame supporting the mechanism, the bearings thus formed between thepinion shaft and the frame comprising simply the outer ends of saidshaft, which are thus subjected to great wear and tear resulting intheir rapid destruction and leaving the action of the mechanism wabblyand inaccurate. I avoid these difficulties by furnishing a long bearingfor the parts, thus distributing the wear and preventing the injuriesmentioned.

The invention is an improvement on my patent of August 28, 1906, No.829,553.

The invention is illustrated by the accompanying drawings in which-Figure 1 is a plan view of-a pressure gage equipped with the indexmechanism. Fig. 2 is a section on the line 22 Fig. 1, showing myimproved mounting of the pinion.

Fig. 1 shows a pressure gage inclosed within the case 1 and having thegage mechanism mounted upon the gage socket 2. The Bourdon tube spring 3has its inner end fixed to said socket and to its free outer end isattached the slotted link 4 adjustable longitudinally on the slottedlink 5 pivoted to the slotted link 6, adjustable longitudinally on thearm of the sector 7 which is mounted in the frame 8 and engages theinion 9 on whose shaft 10 is mounted the in ex hand 11.

Specification of Letters Patent.

Patented Sept. 8, 1908.

Serial No. 406,549.

My invention consists in boring the pinion I shaft at 20 and mounting itupon the stud 21 fixed in the lower plate 13 and furnishing such shaft,toward its outer end, with the shoulder 22 adapted to engage the innerside of the upper plate 12, leaving its outer end reduced and adapted toextend through said upper plate and receive the index hand 11. The pinion shaft 10 is thus rotatably mounted upon the stud 21, having a longbearing thereon, while the bearings between the pinion shaft and theframe plates are loose, so that substantially all the wear between theparts is distributed along the stud. The spring 23 has one end fixed tothe pillar 141 of the frame and the other end fixed to the pinion shaft10, and its function is the usual one of taking up any lost motionbetween the pinion and the sect-or, thus maintaining a firm engagementbetween these parts.

Having described my invention what I claim and desire to secure byLetters Patent 1. In a pressure gage as described, the combination, withthe gage mechanism, of a frame suitably supported and index mechanismmounted thereon comprising a sector and a pinion cooperating with saidsector, the pinion having a bored shaft rotatably mounted upon a studfixed in said frame and forming with said stud a long bearing, togetherWith intermediate mechanism and registering means; substantially asdescribed.

2. An index mechanism comprising a frame and mounted thereon a sectorand a pinion cooperating with said sector, the pinion having a boredshaft rotatably mounted upon a stud fixed in said frame and forming withsaid stud a long bearing and said pinion shaft being adapted to carry anindex hand; substantially as described.

In testimony whereof I have affixed my signature, in presence of twowitnesses.

GEORGE SPENCER.

WVitnesses:

GEORGE G. CLARK, RALPH W. FosrER.

